Electric operation of elevators.



No. 683,689. Patented Oct. l, 190i. J. D. IHLDER.

ELECTRIC OPERATION OF ELEVATORS.

(Application filed Apr. 26, 1901. (No Model.) 2 Sheets-Sheet I.

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No. 683,689. Patented Oct. I, I901.

J. D. IHLDER.

ELECTRIC OPERATION OF ELEVATORS.

LApplic-tion fllod. Apr. 28, 1901.)

2 Shoots-Sheet 2.

(No Model.)

swuewtoz UN TED STATES PATENT OFFICE.

.IOHN 1). IHLDER, 0E YONKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COMPANY, OF EAST ORANGE, NEW JERSEY.

ELECTRIC OPERATION OF ELEVATORS.

SPEGIEICAEION forming part of Letters Patent No. 683,689, dated October 1 1901 Application filed April 26, 1901. Serial No. 57,616. (No model.)

To all whom it may concern:

Be it known that I, JOHN D. IHLDER, acitizen of the United States, residing at Yonkers, in the county of \Vestchester and State of New York, have invented certain new and useful Improvements in the Electric Operation of Elevators, of which the following is a specification.

My invention relates to the electrical operation of elevators by the use of a push-button system; and it has for its object to provide a simple, cheap, and effective system of controlling elevators; and it consists in the various features of construction and arrangement of parts having the general mode of operation substantially as hereinafter more particularly set forth.

My invention relates more particularly to 'an improvement upon the system of electrical operation of elevators shown and described in my application for Letters Patent, Serial No. 660,873, filed December 6, 1897, and entitled Electrical operation of elevators by asingle push-button systein. In that application means are provided whereby with the use of a single push-button or circuit-closer in connection with each floor the elevator-car may be brought automatically to that floor ready for use. Furthermore, by the invention described in that application it is not necessary that the operator should see the car and break the circuit to stop it, as it will automatically stop at the floor to which it is called, and it is not necessary to keep the button closed which has just been pressed, as an ordinary pressure of a few seconds duration is all that is required to call the elevator to the desired floor, regardless of its position.

' The circuits controlling the operation of the elevator-motor are so arranged that a shorter circuit is provided around each push-button simply pressing any button, and the circuits are so arranged that if the operator changes his mind and desires to stop fitgSOlilG llltQI'll'lG- diate floor or at any other position he can instantly do so. The usual safety devices are also used in connection with that system, so that if any door of the wellor the door or gate of the elevator-cage is open the circuit is broken and the elevator cannot be moved until the doors are properly closed. Other results are obtained by the invention described in the application referred to by means of which a simple and inexpensive system is provided capable of being operated by a pushbutton at each floor or in combination with a series of push-buttons on the car, each pushbutton corresponding to a floor. That invention as well as myimprovements thereon, hereinafter to be described, are specially for use in connection with du tub-waiters, freightelevators, orother moving'vehicles in which the operator does not ride, but which it is desired to call or send to any particular floor or position and have it there automatically stopped, regardless of its prior position.

In my former application the arrangement of circuits for controlling the elevator-motor was such that upon the car coming to a stop, whether called or set in motion from a landing-floor or set in motion by the passenger in the car, it could again be started in either direction by means of the push-buttons at the landing-floors or stations or by means of the pushbuttons on the car. This operation makes it necessary that the passenger in the car upon arrival at his destination shall at once open the car-door, thereby breaking the motorcontrollingcircuitby means ofaswitch, as otherwise the car could be again started from any landing-floor or station push-button.

While my presentinvention, as shown, embodies substantially the same general arrangement of electrical circuits as shown and describedin myapplication Serial No.660,873, before referred to, and the ends sought to be obtained are of the same general character as the objects hereinbefore set forth, my improvement consists in so arranging the circuits for controlling the elevator-motor that if the car has been started by a passenger in the car pressing a particular push-button and the car has come to a stop at the desired landing or station the car is still under the control of the passenger and can only again be started by him and cannot be started or operated from any of the landings or stations unless either a safety button or switch on the car is pressed, which is connected to break the controlling-circuit in such manner as to restore all the controlling apparatus to normal conditions, or else the car door or gate is opened and then closed or a landing-door opened and closed or non interference switches, hereinafter to be described, opened and closed, invall of which cases the controlling circuit andapparatus are restored to normal conditions to be operated from either the car or the landings or stations. The utility of this arrangement is apparent, in that accidents are prevented and certainty of operation is attained without confusion. On the other hand, my present invention provides means whereby after the car has been set in motion from a floor or station button and has been stopped at the desired station the controlling-circuit is left in such condition that the car may be again set in motion from the same or another floor push-button, and this is so provided to guard against that case where the operator at a particular floor" or station calls the car and neglects to use it and fails to open and again close the landingdoor, which would result in leaving the floorbutton circuits open if the arrangement of circuits were such as described in connection with the push-buttons on the car. It will thus be'seen that there are motor-controlling being one of these non-interference switches may be arranged to be closed and opened by any'suitable means; but I have shown them operated by whatI have termed reversing-switch, which changes the motor connections tocause it to rotate in different directions. Connections are shown whereby what I have termed acceleratingmagnets cut out resistance in the armature-circuit and series field-coils on starting and throw them.

into the circuit again on stopping the motor.

My improvements, furthermore, consist in arranging switches operated by the acceler ating-magnets referred to and connected to the switches which they control, so that after the motoris started the circuits controlled by the push-buttons at the different floors or stations and those controlled by push-buttons on the car are interrupted in such manner as to preclude any possible interference with the operation of the car from a landing or station when the car is being controlled by a passenger.

In the accompanying drawings I have illustrated the circuits and apparatus necessary to accomplish the results described under'the general terms of my invention.

In the drawings, Figure 1 illustrates diagrammatically the arrangement of circuits and apparatus in accordance with my invention. Figs. 2 and 3 are respectively side and end views of an electrical reversing= switch. Fig. 4: is a side View of a modification of the reversing-switch, which includes the contacts of the non-interference switches, showing their mode of operation.

In the drawings, A is theshaft of an armature A of an electric motor, which is the preferred means of operating the elevator-car, the car and connections between it and the armature of the motor for operating it being omitted, as they may be of any well-known or desirable construction,it only bei ng necessary that they are such connections as will move the 'car in one direction or the other, accordingto the direction of rotation of the motor. Any suitably-wound motormay be used to operate the elevator-car; but I have shown one in which A represents the shunt fieldmagnetwinding, while A represents a series winding adapted to increase the torqueon starting, but preferably arranged to be subsequently cutout of circuit, thereby reducing the torque, but accelerating the speed of the motor. A represents a brake-magnet, pref erably arranged in ashunt around the motor,

.by which the ordinary mechanical brake of the elevator-engine is controlled, it being understood that the brake is normally on to prevent the engine operating except when the current is flowing through the magnet A, the brake being then released, but is again automatically applied when the current ceases. For convenience of illustration, a a a a a a5 represent binding-posts on the motor, to which the terminals of the motor-circuits are connected and to which also the circuits leading to and from the motor are connected. 7

In order to control the circuits of the motor, I make use of substantially the same type of electric"reversing-switch B-described in my prior application; but this may of course vary in construction and operation, it only being necessary to be so constructed as to control the circuits of the motor and to be itself controlled by the elevator-operating circuits. I prefer the construction illustrated more fully in Figs. 2, 3, and 4 and indicated in the diagram by similar letters. In the present instance the electric reversingswitch consists, essentially, of two magnets B B arranged opposite each other, with an armature B suspended between the magnets. Mounted in the armature are a number of double-faced contacts Z) I) b 19 preferably of carbon, and each connected by a suitable conductor to a corresponding bindingpost on the top of the armature or otherwise. These double-faced contacts 011 the armature are arranged to cooperate with similar contacts arranged on either side of the armature and preferably under the magnets,

and these contacts are designated for convenience in the present instance as b b b b b b b b, as indicated in the diagram. The mechanical construction of all of these contacts is preferably the same as described in my former application referred to. In the present instance additional double-faced contacts are shown for my reversing-switch and lettered Z9 Z1 and b b. The construction of a modification of the reversing-switch containing these additional contacts is shown more particularly in Fig. 4, in which 19 represents a double-faced contact adapted to make contact with I), held in a socket 13', having a stem B adapted to slide under spring-pressure in the support B. The operation of contacts I) 12 being the same as the opposite pair b N the construction described for one set applies to both. One of the contacts, as b, is suitably supported upon an insulating-piece B, while the other contact I) is suitably supported upon an insulating-piece 13*, carried in any convenient manner by the stem B so that when the double-faced contact 12 impinges upon contact b and moves the spindle in its support contacts I) and D are separated. Any two opposite sets of contacts in my reversingswitch could be provided with the additional contacts Z1 Z1 and b Z7 but they are preferably shown for convenience upon two opposite contacts at the end of the switch, while in the diagram of Fig. 1 they are shown entirely separate; but it is to be understood that their operation is substantially as herein described, and they may hereinafter be designated as non-interference switches 10 and 11 when their function is more particularly described.

While, as before intimated, the electric reversing-switch just described is the preferred form and while I have described it sufficiently to enable its operation to be understood in the present case, I do not herein claim the same.

In order to operate the electric reversingswitch automatically when any push-button corresponding to any floor or station is operated, I have shown substantially the same means as described in my prior application referred to, and the same will not be again described in detail. The means provided has been termed a floor-controller C and is indicated diagrammatically in Fig. 1. It will suffice to say that this controller 0 is connected in some suitable way to be operated in unison with the motor or the engine of the car; but as this controller and its connections are not part of the improvements embodied in this invention they have not been shown and described. The controller embodies a cylinder or drum C on the periphery of which I have shown contacts in the form of two semicircles O 0 insulated from each other by suitable insulation C being the equivalent of the particular construction set forth in my prior application. There is a brush 0 normally engaging contact C and connected by a conductor with one of the coils B of one of the magnets 13 B of the electric reversing-switch B, and there is another brush 0' normally bearing on the contact 0 connected to the coil B of the other of the magnets B B of the reversing-switch, and it will be observed that both of these magnets are connected directly to the negative feeding-main at N through a switch L, the function of which may be to limit the travel of the car in either direction; but as this function is not a part of my present improvement this switch will not be further described. It may operate in any usual and desirable manner.

The non-interference switch 11 is placed in the circuit of the magnet-coil B while the non-interference switch 10 is placed in the circuit of the magnet-coil B and in the diagram of Fig. 1 these switches 10 and 11 are so disposed on each side of the reversingswitch B that when a circuit is completed through the magnet-coil B, for instance, the operation of the reversing-switch will cause contact to be broken at non-interference switch 10, thereby making it impossible to energize magnet-coil B which might interfere with the control of the motor. On the other hand, should magnet-coil B be ener-- gized the circuit of the magnet-coil B" would be broken at non-interfereuce switch 11. Any other suitable means might be provided for preventing the interference of one operating magnet-coil with the other, and I have only shown a particular means which is used, preferably, because of its adaptability to the construction described. When a current flows through one or other of the coils B B the corresponding magnet B B is energized and the armature B moved to one or the other side to close the circuit between the doublefaced contacts and one or the other of the sets of contacts corresponding with the magnet energized, and consequently the circuits &

through the motor will be in a direction to cause it to raise or lower the elevator, as required.

Also arranged in connection with the 'floorcontroller are a seriesof brushes ff f f one for each floor or stopping-place of the elevator-car and numbered to correspond with the stations F F F F Connected to each brush f to f is a conductor d d d (:1 each including a circuit-making magnet D and each leading to a position corresponding with the respective floors and terminating at the push-button or other switch device forthat floor. The armature D of each of the circuitmaking magnets D is connected to a conductor e, leading to the center of the coils of a differentially-wound circuit-breaking magnet E, which normally does not attract its armature, and leading from the stationary contact E for said magnet is a conductor H, which passes through a switch I, having contacts'zlz",

and passes in the direction of the floors or stations. This conductor has branches e e e e leading to the push-buttons corresponding with the floors, the push-buttons or circuit-closing devices in the present instance being represented by the pins 9 g g g One end of the double winding of the magnet E terminates in a pivoted armature E having a spring E which normally holds it against the stationary contact E.

Up to this point the arrangement of circuits for controlling the elevator-motor has been described as being substantially the same as the circuits in my prior application referred to, and while in that application there were push-buttons arranged upon the car to correspond to the landing-floors or stations, as there are also car push-buttons to be hereinafter described as pertaining to this invention, in the prior application the circuits for the car and for the car push-buttons were all in parallel with the circuits for the landing or station push-buttons, as they are in this invention; but the point from which the car push-buttons derived their electrical energy was situated upon the controlling-circuit beyond the doubly-wound magnet E-that is, at a point on the circuit intermediate to those points from which the floor or station pushbuttons derived their current. In order to carry out the improvements which form the present invention, I connect the circuit through which the car push-buttons are ene rgized at a point on the controlling-circuit intermediate of the coils on the doubly-wound magnet E. Therefore from the point 0 leads a conductor which passes through the coil of an eleotrornagnetG, the function of which is hereinafter to be described. From the coil of the electromagnet G connection is made to a stationary contact G, and from thence a conductor H leads to a switch I, having the contacts 1' t and from thence a conductor H leads to' the push-buttons on the car. The car push-buttons g g g gtare connected in parallel with the station or landing e'sacse push-buttons and respectively connect to the conductors leading from the station pushbuttons to the circuit-making magnets D. The magnet G, I have termed my safetymagnet for reasons hereinafter to appear, and when energized this magnet attracts a spring-controlled armature G against a staother and are adapted to be energized by the operation of the reversing-switch B when it is thrown either to the right or leftthat is,

so thrown as to start the elevator-motor in one direction 01' the other. The force of the magnets M M may be regulated by suitable winding, or springs of difierent tensions may be connected to the back contacts of switches 1 and 2, or any suitable means may be provided whereby one of the switches, preferably 1, will be closed before switch 2. By the closing of switch 1 it will be seen that a resistance R is cut out of the armature-circuit after the motor has started, while upon the closing of switch 2 the series fields are shortcircuited, accelerating the speed of the motor after starting. 1 and 2 opens switches I I, which interrupts both the circuit to the station push-buttons and the circuit'to the car push-buttons. Also leading from the circuit-breaking magnet E is a conductor H, which passes through a flexible cable to the car and includes in the circuit on the car a push-button 9 by means of which the circuit can be broken at any time by a person on the car, and it also includes a car gate or door contact h p The push-buttons in the car are lettered correspondingly to the push-buttons at the floors or stations, and the closure of a push-button on the car corresponding to any floor will close the circuitthrough the reversing-switch, which will close the circuit through the motor in the proper direction and move the car and the floor-controller. the conductor'H. are also placed the circuitbreakers h k h h, controlled by the doors of the well corresponding to the different floors, and this conductor H extends to and is connected with the positive main.

I will now explain briefly the operation of the apparatus when a floor or station pushbutton is pressed, assuming that the doors to the well are all closed, closing the contacts h h h h, and assuming, for instance, that the The closing of switches In the circuit 0t ing a circuit which maybe traced as follows: Current entering the conductor H from the positive main passes through the door-contacts h to h, then through. the flexible cable to the car-gate switch 71. through safety or stop push-button 9 back through the flexible cable, and by conductor 11 to the circuit-breaking magnet E, through both coils of that magnet, which coils are wound in opposition to the spring-controlled armature E The armature E being kept normally in contact with the stationary contact E, makes a closed switch through which the current passes to interrupting-switch 1, then stillbyconductor H in the direction of the flooror station push buttons, thereby supplying current to the parallel circuits of the floor push-buttons. Floor push-button being closed, the current passes to the conductor (1 to the core of the corresponding circuit-making magnet D, thence through the coil of that magnet, and to the brush f, bearing on the contact C Thence the current passes to the brush through the coils B of the electric reversingswitch 13, and from thence passes through the closed contacts of non-interference switch 10 to one side of limit-switchL and from there to the negative main at N. This energizes one of the magnets of the electric reversingswitch, moving the armature B thereof in the proper direction, causing its double-faced contacts I) b b 11", respectively, to make contact, say, with the contacts I) b b 12 thus closing the circuit of the motor, which may be traced as follows: from the plus main through the contacts 1) b to binding-post a, whence a branch includes the shunt field'coils A the circuit of which passes to the negative main through the binding-post a From post a a conduct-or extends tothe point a, so that the current passes from a through a starting resistance R to bindingpost a, from thence through the series field-coils A to post a thence through contacts I) b to post a and brush S of the motor, through the armature to brush S, thence from post a through contacts b b to the negative main, thus causing the motor to rotate in a certain direction to raise the elevator. A branch, including the brake-magnet A, extends between the points a and N, so that the brakemagnet is only energized when the circuit of the motor is completed. Rotation of the motor will cause the floor-controller drum to rotate in the direction of the arrow, and it will be seen that the circuit described will be maintained until this drum has rotated sufficiently to allow the brush f to come upon the insulating portion C between the contacts (1 C, which Will break the circuit at the magnet B releasing the armature of the reversingswit-ch and stopping the motor. In order to overcome the necessity of holding the pushbutton g in contact position and in order to prevent interference with the elevator when it is once started, the circuits are arranged so that immediately on completion of the circuit closed by the push-button g the circuit-making magnet D attracts its armature D, making a parallel and shorter circuit through the door-contacts h to h", conductor H, through one coils only of the circuit-breaking magnet E, and the armature and coils of the circuitmaking magnet D, thence through the brush f and out as before. One of the coils of the differentially-wound circuit-breakingmagnet E is therefore short-circuited and the core becomes magnetized, attracting its armature E and breaking the circuit through conductor H, leading to the push-button, and as soon as this is accomplished the button may be released; but the controlling-circuit will be maintained closed at the circuit-making magnet D until finally broken at the desired moment by the floor-controller 0 when the car reaches its destination. If in the meantime any of the bush-buttons, as 9 is operated, the circuit cannot be completed so as to interfere with the travel of the car. When the car arrives at the desired floor, if the door of the well is opened, breaking the contact h,

-it will be obvious that the car cannot be started until such contact is closed. It is also obvious that in order to prevent any one at an intermediate floor from opening the door wellknown contrivances may be used which will prevent the opening of the door except when the elevator-car is opposite thereto. If then the elevator, being at the top floor, should be desired at any other floor and the corresponding push-button is pressed and the well-doors being closed as before, the circuit will be completed as before, except that the reversingswitch will be operated to close the circuit through the motor to cause it to move the ele vator-car in a downward direction, and when it has once started the push-button may be released and no one can interfere with the,

operation of the elevator until it reaches its destination.

It will be seen that when the controllingcircuit is broken by the floor-controller when the car has arrived at the desired point magnet E becomes deenergized and allows its armature E to again assume its normal position in contact with the fixed contact E, so that the circuit is ready to be made again by pressing any particular push-button. In other words, after the car has been called by operation of a floor-station push-button and has been brought to a stop at its destination it is still under control from any one of the landings or stations provided the well-doors are closed, which close the switches h to it.

As hereinbefore stated, my improvement consists, primarily, in so arranging the motor-controlling circuits that if acar has been started by a passenger in the car pressing a particular push-button and the car has come to a stop at the desired landing or station the circuits remain under the control of the passenger and the car can only again be operated by him and not from any one on a landing or station unless, as described, a landingonly. Assuming that the landing-door switches 72 to 72 are closed, that the car-gate switch it is closed, that the safety or stop switch on the car 9 is closed, and assuming that the car is at the bottom of the well and it is desired to cause it to rise to the top floor F the button g on the car should then be pressed for an instant, and assuming this to have been done a circuit will be closed as follows: Current entering the conductor H from the positive main passes through the door-contacts h to hflthen through the flexible cable to the car-gate switch h through safety or stop push-button 9 back through the flexible cable, and by conductor H to the circuit-breaking magnet E; butinstead of passing through both coils of this magnet it passes through but one coil 3 to the point 0, and from thence through thecoils of the safety-magnet G to the stationary contact G, thence by conductor H to interruptingswitch I, through the switch, and by conductor H to the flexible cable and to the car push-button g pressed, from thence back through the flexible cable, and by conductor d to the core of the corresponding circuitmaking magnet D, and through the coil of that magnet to the brush f and from thence the-course of the current and the operation of the circuit-controlling apparatus are as before described when the floor push-button g was pressed to call the car upward.

- Returning to the operation of the safetymagnet G, it will be seen thatthe coils of this magnet have become energized, which causes it to attract its spring-controlled armature G against the fixed contact G, and

' thus close a short circuit through a high resistance R directly to the negative main at r. Since the current has branched at the point 0, when the armature D of a circuitmaking magnet D is attracted against its core it is generally found necessary to insert a compensating resistance R in the controlling-circuit between the point 0 and the negative main, for convenience of illustration this compensating resistance B? being shown in the circuit between the 'point 0 and a magnet D. The resistance R is so adjusted as to balance the resistance R when in circuit with the'safety-magnet G, so that the circuit through the safety-1nagnet remains continually closed when its coils are once energized. It will be observed that since but one coil .9 of the circuit-breaking magnet E is energized in this described case of operating the car from a car push-button magnet E will here at once attract its armature E so that it will be impossible to interfere with the operation of the car by the closure of a landing or station puslrbutton. Whenthecircuitforcontrolling the motor is broken at the floor-controller to stop the car at a particular floor or landing, there still remains avclosed circuit through which current is flowing,including the coils of the circuit-breaking magnet E, which may be traced as follows: from the landing-switches h to it through conductor H, through the'flexible cable to gate-switch k and safety-switch 9 back by conductor H, through the flexible cable to the coils of the magnet E, thence through the coils of safety-magnet G, contact G, and armature G which latter is maintained against contact G, thence through resistance R to the negative main at I. Therefore, since current is supplied to the pushbuttons on the car through the branch conductor H,which taps onto the stationary contact G, and through conductor H it is seen that the car is only under the control of a passenger by means of the car push-buttons, for since the coils of the magnet E maintains the floor-push-button circuit broken between'the armature E and contact E it will be obvious that the car cannot be operated from anylanding or station push-button.

In order to prevent with certainty the possibility of interference with the operation of the motor from a landing when it is being operated from the car, and vice versa, the switches I I have been provided, I being in the circuit which supplies the landing pushbuttons with current and 1 being in the branch which supplies the car push-buttons are operated by the back contacts is k of the switches 1 2. Suitable insulated connections are made between the contacts 2' '6 and the back contacts 71:75, so that the contacts 1; t are moved with the back contacts is. (Jontacts 7071' are adapted to be moved successively to close the switches l 2 by the accelerating-magnets M M, switch 1 being preferably closed before switch 2. Magnets M M are shown in series with each other and derive theirenergizing-current from the contacts b b on the electrical reversing-switch B, they being preferably arranged, as will be I seen, in a shunt directly across the armature,

so that they Will become energized to attract their armatures after the motor has come up to speed. Suitable electrical connection is made, so that when switch 1 is closed resistance R is cut out of the armature-circuit; but other suitable connections could be made whereby more or less of the resistance is cut out of the armature-circuit at any one time or successively, I having shown the whole resistance as being cut out at once for simplicitys sake only. The connections and apparatus, as before stated, are so arranged that when switch 2 is closed the series coils are cut out of circuit, the magnet M being with current. The contacts of these switches so adjusted that it will operate at the desired time after the motor has started, and the speed of the motor is then accelerated.

By the complete system, as shown and described, for the electrical operation of elevators by a push-button system it is clear that after the car has been operated from any landing or station push button and has been brought to a stop at the desired station by a breaking of the controlling-circuit at the floorcontroller all of the necessary parts for again operating the car will have resu med their normal positions, so that the car is still under the control of any one on the landing or station. On the other hand, it. is clear that after the carhas been operated by the closure of a pushbutton on the car and the circuit controlling the motor has been broken at the floor-controller, bringing the car to a stop at its destination, certain parts of the controlling apparatus connected with the breaking-magnet E and the safety-magnet G will not have resumed their normal positions, which normal position is necessary to enable the car to be controlled from a station or landing pushbutton. In other words, in the case where the car has been operated from a car pushbutton and has come to a stop a particular part of the controlling-circuit, including the circuit of the car push-buttons, still remains closed, while that particular part of the controlling-circuit including the floor or landing push-buttons is maintained in open circuit. Therefore in this case the car cannot be operated from a floor until first that particular part of the circuit remaining closed after the car has stopped has been blOk6I1--&S, for instance, at a door-switchto restore the floorcircuit to a normal condition at the circuitbreaking magnet E, and, secondly, the circuit must again be completed at the doorswitch broken in order to place all the controlling-circuits in readiness for subsequent operation.

\Vithout limiting myself to the precise details of construction shown and described, I claim and desire to obtain by Letters Patent the following:

1. The combination with a motor, car and station, of motorcontrolling devices connected to the car and station and means for elvcluding control of the car from the station, after the car has come to rest, substantially as described.

2. The combination with a motor, car and station, of motor-controlling devices connected to the car and station and means for excluding control of the car from the station, after the car has come to rest, until the station control has been restored from the car, substantially as described.

3. The combination with a car and operating-motor, of two motor-controlling devices, means for excluding the starting control from one controlling device after the car has been started from the other until the car is stopped and control is restored and means for restoring said control, substantially asdescribed.

t. In an apparatus forcontrollingelevators, the combination with an elevator-motor, of push-buttons for each lioor or station, pushbuttons on the car, corresponding to the several floors or stations, with circuits and connections, including the push-buttons and motor, for controlling the operation of the motor, and means for preventing the subsequent control of the motor from a floor or station, after it has been operated from the car and stopped, substantially as described.

5. In an apparatus for controlling elevators, the combination with an elevator-motor, of

push-buttons for each iloor or station, pushbuttons on the car, corresponding to the several floors or stations, with circuits and connections, including the push-buttons and motor, for controlling the operation of the mo tor, and means for preventing the subsequent control of the motor from a floor or station, after it has been operated from the car, and the motor has come to rest, substantially as described.

6. In an apparatus forcontrolling elevators, the combination with an elevator-motor, of a push-button for each floor or station, pushbuttons on the car, corresponding to the several floors or stations, with circuits and connections, including the push-buttons and motor, for controlling the operation of the motor, and means for preventing the subsequent control of a motor from a floor or station, both before and after the motor has come to rest, after it has been operated from the car, substantially as described.

7. Inan apparatus forcontrollingelevators, the combination with a motor for operating the car in either direction, of a push-button for each floor or station, pnshbutt-ons on the car, corresponding to the several floors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the push-button, and means for preventing the subsequent operation of the motor-car from a floor or station, after it has been started from the car and stopped, substantially as described.

8. In an apparatus for controlling elevators,

[ the combination with a motor for operating the car in either direction, of a push-button for each floor or station, push-buttons on the car, corresponding to the several floors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the push-button, and means for preventing the subsequent operation of the motor from a floor or station, both before and after the motor has come to rest,

after it has been operated from the car, substantially as described.

9. In an apparatus forcontrolling elevators, the combination with a motor for operating the car in either direct-ion, of a push-button for each floor or station, push-buttons on the car corresponding to the several floors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the push-button,and

means for preventing the subsequent opera-, tion of the motor from a floor or station, after it has been operated from the car, and the car has come to rest, substantially as described.

10. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car corresponding to the several floors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the pushbutton, and means for preventing the subsequent operation of the motor from a floor or station, after it has been operated from the car, until a portion of the controlling-circuits,

. including the car push -buttons, has been broken and again closed, substantially as described.

1.1. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-but tons on the car corresponding to the several floors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the pushbutton, and means for preventing the subsequent operation of the motor from a floor or station, after it has been operated from the car, until a portion of the controlling-circuits remaining energized after the motor has come to rest, has been broken and again closed, substantially as described.

12. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car corresponding to the several floors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged. that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the pushbutton, and means for preventing the subsequent operation of the motor from a floor or station, after it has been operated from the car, until a portion of the controlling-circuits remainingenergized after the motor has come to rest, and including the car push-buttons, has been broken and again closed, substantially as described.

13. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car, corresponding to the several floors or stations, and controlling-circuits and connections between the bush-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated tobring the car to the station corresponding to the pushbutton, and means operating to leave the motor under control from the car only, subsequent to its operation from the car, substantially as described.

' 14. In an apparatus for controlling elevators, the combination With an elevator-motor,v

of a push-button for each floor or station, push-buttons on the car, corresponding to the several floors or stations, with circuits and connections including the push-buttons and motor, for controlling the operation of the motor, and means for preventing the subsequent control of the motor from a floor or station, after it has been operated from the car, until aportion of the controlling-circuits, including the car push-buttons, has been broken and closed, substantially as described.

15. In an apparatus for controlling elevators, the combination with an elevator-motor, of a push-button for each floor or station, push-buttons on the car, corresponding to the several floors or stations, with circuits and connections including the push-buttons and the motor, for controlling'the operation of the motor, and means operating to leave the motor under control from the car only, subsequent to its starting from the car and its stopping, substantially as described.

16. In an apparatus for controlling elevators, the combination with an elevator-motor, of a push-button for each floor or station, push-buttons on the car, corresponding tothe several floors or stations, with'circuitsi and connections including the push-buttons and motor, for controlling the operation of the motor, and means operating to leave the motor subsequent to its operation from the car, under control from the car only, until a 1 connections including the push-buttons and motor, for controlling the operation of the motor, and means operating to leave the motor subsequent to its operation from the car, under control from the car only, until a portion of the controlling-circuits remaining energized after the motor has come to rest, and including the car push-buttons, has been broken and again closed, substantially as described.

18. In an apparatus for controlling elevators, the combination with an elevator-motor, of a push-button for each floor or station, push-buttons on the car, correspondingto the several floors or stations, with circuits and connections including the push-buttons and motor, for controlling the operation of the motor, and means for preventing the completion of the motor-controlling circuits from a floor or station to operate the motor, subsequent to their completion from the car, after the car has reached its destination, substantially as described.

19. In an apparatus for controlling elevators, the combination in an elevator-motor, of a push-button for each floor or station, push-buttons on the car, corresponding to the several floors or stations, with circuits and connections including the push-buttons and motor, for controlling the operation of the motor, and means for preventing the completion of the motor-controlling circuits from a floor or station to operate the motor, subsequent to their completion from the car, both before and after the car has reached its (lestination, substantially as described.

20. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car corresponding to the several floors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the pushbutton, means for automatically closing a circuit around said push-buttons after one of them has been operated, for preventing interference with the movements of the car, and means for preventing the subsequent operation of the motor from a floor or station after it has been operated from the car, and the car has come to rest, substantially as described.

21. In an apparatus for controlling elevators, thecombination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car, corresponding to the several floors 0r stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the pushbutton, means for automatically closing a circuit around said push-buttons after one of them has been operated, for preventing interference with the movements of the car, and means for preventing the subsequent operation of the motor from a floor or station, both before and after the motor has come to rest, after it has been operated from the car, substantially as described.

22. In an apparatus for controlling eleva tors, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car corresponding to the several floors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the push-button, means in the push-button circuits for short-circuiting the push-buttons when any one is closed,thereby preventing interference, and means for preventing the subsequent operation of the motor from a floor or station after it has been operated from the car, and the car has reached its destination, substantially as described.

23. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car, corresponding to the several doors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the push-button, means in said push-button circuits for short-circuiting the push-buttons when any one of them is closed, and for breaking the circuit of the floor push-buttons, and means for preventing the subsequent operation of the motor from a floor or station after it has been operated from the car, and the car has come to rest, substantially as described.

24. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car, corresponding to the several floors or stations, circuit-making magnets for the push-button circuits, and a circuitbreaking magnet controlled thereby, whereby the push-button circuits are short-circuited and the floor-push-button circuit broken, to prevent interference, and means for preventing the subsequent control of the motor from a floor or station, after it has been operated from the car, and the car has come to rest, substantially as described.

25. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car, corresponding to the several floors or stations, circuit-making magnets for the push-button circuits, and a circuitbreaking maguet controlled thereby, whereby the push-button circuits are short-circuit ed and the floor-puslrbutton circuit broken,

to prevent interference, and interrupting switches in the push-button circuits, also to prevent interference, arranged to be automatically operated after the motor has started, substantially as described.

26. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car corresponding to the several floors or stations, circuit-making magnets for the push-button circuits, and a circuit-breaking magnet controlled thereby, whereby the pushbutton circuits are short-circuited and the floor-push-button circuit broken, to prevent interference, interrupting switches in the push-button circuits,-also to prevent interference, arranged to be automatically operated after the motor has started, and means for preventing the subsequent control of the motor from a floor or station, after it has been operated from the car, and the car has come to rest, substantially as described.

27. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car corresponding to the several floors or stations, and controlling-circuits and connections between the push-buttons and the motor, so arranged that when any push-button is operated, circuits are completed and the motor operated to bring the car to the station corresponding to the push-button, means in the push-button circuits for short-circuiting the push-buttons when any one is closed, thereby preventing interference, and interrupting-switches in the push-button circuits, also for preventing interference, arranged to be automatically operated after the motor has started, substantially as described.

28. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car, corresponding to the several floors or stations, circuits and connections including the push-buttons, and motor, a circuitbreaking magnet controlling the floor-pushbutton circuit, and a safety-magnet included in the car-push-button circuit, and controlling a short circuit to the line, and means for maintaining said short circuit closed after the car has come to rest, subsequent to the operation of the motor from the car, to allow the motor to be controlled from the car, substantially as described.

29. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a pushbutton for each floor or station, push-buttons on the car, corresponding to the several floors or stations, circuits and connections including thepush-buttons and motor, a circuitbreaking magnet controlling thefioor-pushbutton circuit,and a safety-magnet included ceased in the car-push-button circuit and controlling a short circuit to the line, and means for maintaining said short circuit closed, both before and after the car has come to rest, subsequent to the operation of the motor from the car, to allow the motor to be controlled from the car, substantially as described.

30. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a push-button for each floor or station, push-buttons on the car, corresponding to the several floors or stations, circuits and connections including the push buttons and motor, circuitmaking magnets for the push-button circuits, and a circuit breaking magnet controlled thereby, whereby the push-button circuits are short-circuited and the fioor-push-button circuit broken, a safety-magnet included in the car-push-button circuit controlling a short circuit to line, and means for maintaining said short circuit closed both before and after the car has come to rest, subsequent to the operation of the motor from the car, whereby the motor may be controlled from the car only, substantially as described.

.31. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a push-button for each floor or station, and controllingcircuits and connections between the pushbuttons and the motor, whereby when any push-button is operated,.circuits are closed and the motor operated to bring the car to the station corresponding to the push-bu tton, and means in the controlling-circuits, operated by a motor-reversing switch, for preventing a reversal of the elevator-motor while in operation, substantially as described.

32. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, ofa push-button for each floor or station, and controlling-' circuits and connections between the pushbuttons and the motor, whereby when any push-button is operated, circuits are closed and the motor operated to bring the car to the station corresponding to the push-button, and non-interference switches in the motorcontrolling circuits for preventing interference with movements of the carwhile in op-' eration and a reversal of the elevator-motor, substantially as described.

- 33. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a push-button for each floor or station, controlling-circuits and connections between the push-buttons and the motor, whereby when any pushbutton is closed the motor will be operated to bring the car to the-desired station, means for automatically closing a circuit around said push-buttons after one of them has been operated, thereby preventing interference with the movements of the car, and additional means in the controlling-circuits, operated by a motor-reversing switch, for preventing a reversal of the elevator-motor while in operation, substantially as described.

34. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of push-buttons for each floor or station, controlling-circuits and connections between the push-buttons and the motor, whereby when any pushbutton is closed, the motor will be operated to bring the car to the desired station, means for automatically closing a circuit around said push-buttons after one of them has been operated, thereby preventing interference with the movements of the car, and non-interference switches in the motor-controlling circuits for preventing a reversal of the motor while in operation, substantially as described.

85. In an apparatus for controlling elevators, the combination with a motor for operating the ear in either direction, of a push-button for each floor or station, controlling-circuits and connections whereby when any push-button is operated a circuit is closed between the car and the desired floor, and means in the push-button circuits for shortcircuiting the push-buttons when any one is closed and thereby preventing interference with the movements of the car, and additional means in the controlling-circuits operated by a motor-reversing switch, for pre- Venting a reversal of the elevator-motor, substantially as described.

36. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of a floor-controller, a push-button for each floor or station, push-buttons on the car corresponding to the floors or stations, a circuit between each push-button and the floor-controller, and means for preventing the completion of a circuit between a floor push-button and the floor-controller, subsequent to the completion of such a circuit from a car pushbutton, both before and after the car has reached its destination, substantially as described.

37. In an apparatus for controlling elevators, the combination witha motor for operating the car in either direction, of a fioorcontroller, a push-button for each floor or station, push-buttons on the car corresponding to the floors or stations, a circuitbetween each push-button and the floor-controller, means between the floor-controller and each pushbutton for short-circuiting the push-buttons, and means for preventing the completion of a circuit between a floor push-button and the floor-controller, subsequent to the completion of such a circuit from a car push-button, both before and after the car has reached its destination, substantially as described.

38. In an apparatus for controlling eleva tors, the combination with a motor for operating the car in either direction, of an electric reversing-switch controlling the circuit of the motor, a floor-controller controlling the operations of the reversing-switch, a push-button for each floor or station, push-buttons on the car corresponding to the floors orstations, a circuit between each push-button and the floor-controller, and means for preventing the completion of a circuit between a floor pushbutton and the floor-controller, subsequent to the completion of such a circuit from a car push-button, both before and after the car has reached its destination, substantially as described.

39. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of an electric reversing-switch, a floor-controller operated by the motor and controlling the reversingswitch,a push-button for each floor or station, push-buttons on the car corresponding to the floors or stations,a circuit between each pushbutton and the floor-controller, means in said push button circuits for closing a circuit around the push-buttons, and means for preventing the completion of a circuit between the floor-controller and a floor push-button, subsequent to the completion of such a circuit from a car push-button, both before and after the car has reached its destination, substantially as described.

40. In an apparatus for controlling elevators, the combination with a motor for operatin g the car in either direction, of an electric reversing-switch, a floor-controller operated by the motor and controlling the reversingswitch, a push-button for each floor or station, push-buttons on the car corresponding to the floors or stations, circuits between each pushbutton and the floor controller, a circuit-making magnet in each puslrbutton circuit, a circuit-breaking magnet controlled by the circuit-making magnets and arranged to cut out the floor-push-button circuits, and means for preventing the completion of a circuit between a floor push-button and the floor-controller, subsequent to the completion of such a circuit from a car push-button, after the car has reached its destination, substantially as described.

41. In an apparatus for controlling elevators, the combination with a motor for operating the car in either direction, of an electric reversing-switch, a floor-controller operated by the motor and controlling the reversingswitch, a pushbutton for each floor or station, push-buttons on the car corresponding with the floors or stations, circuits between each push-bu tton and the floor-controller, a circuitmakingmagnet in each push-button circuit, and a circuit-breaking magnet controlled by the circuit making magnets and arranged to cut out the floor-push-button circuits, an automatic interrupting-switch for cutting out the car-puslrbutton circuits, and means for preventing the completion of a circuit between the fioor-controller and a floor pushbutton subsequent to the completion of such a circuit from a cai push-button, after. the car has reached its destination, substantially as described.

42. The combination of a motor for operating the carin either direction, motor-com trolling devices connected to the car and stations,non-interferen.ce devices for preventing the controlling devices connected to the car from being operated by those connected to the stations, and interrupting-switches in the controlling-circuits arranged to be operated as the motor is started, substantially as described.

43. The combination of a motor for oper ceased ating the car in either direction, niotor-coni5 trolling devices connected to the car and stations and interrupting-switches controlling said controlling devices and in turn controlled by the operation of the motor, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN D. II-ILDER;

Witn ss'esz' I I I R. MARSDEN, H. W. HARTLEY. 

